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    Wyświetlanie 1-3 z 3
    Tytuł:
    Wpływ geometrii źródło promieniowania-roślina-detektor na wartość teledetekcyjnych wskaźników roślinności
    Assessment of geometry of radiation source-plant-detector on value of the remote sensing indices
    Autorzy:
    Kycko, M.
    Zagajewski, B.
    Podbielska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/132321.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    dwukierunkowość odbicia promieniowania
    BRDF
    teledetekcyjne wskaźniki roślinne
    geometria
    źródło promieniowania roślina-detektor
    bidirectional reflectance distribution
    remote sensing vegetation indices
    geometry Sun-plant-detector
    Opis:
    The aim of this study is an analysis of an influence of geometry electromagnetic radiation (lamp or sun) - research target (leaves) - detector. The electromagnetic radiation was emitted by the lamp ASD ProLamp, which was installed at 30°, 45°, 90°, 135°, 150° angles. Reference measurements was a system in which the lamp and detector were set vertically. During the laboratory measurements spectral properties of Rhoeo spathacea were acquired. Based on the measured spectral curves of vegetation remote sensing indices were calculated and statistical ANOVA tests were applied. The results confirmed the relationship between the geometry of the lamp - plant - detector. The higher the angle the incident radiation results were less diverse and close to optimum values were observed. Analysis of the indicators showed that the high variability characterized by the indicators measuring water, chlorophyll contents and overall vigor parameters of plants. While the tests can be used for measuring rates of nitrogen content, the absorption of carotenoids and photosynthetically active radiation.
    Źródło:
    Teledetekcja Środowiska; 2013, 49; 15-26
    1644-6380
    Pojawia się w:
    Teledetekcja Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie spektralne wybranych gatunków muraw wysokogórskich Doliny Gąsienicowej narażonych na wydeptywanie
    Variability of spectral characteristics of selected high-mountain plant species of Gasienicowa Valey exposed for trampling
    Autorzy:
    Kycko, M.
    Zagajewski, B.
    Kozłowska, A.
    Oprządek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/132353.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    Tatrzański Park Narodowy
    szata roślinna
    teledetekcyjne wskaźniki roślinności
    ruch turystyczny
    wydeptywanie
    Kasprowy Wierch
    Dolina Gąsienicowa
    pomiary spektrometryczne
    ASD FieldSpec
    Tatra Mts. National Park
    Vegetation
    remote sensing vegetation indices
    tourism
    trampling
    Gąsienicowa valley
    spectrometric measurements
    Opis:
    This paper presents analysis of plant cover condition in Gasienicowa Valley in the Tatra Mts. depending on various trampling intensity. Measurements were taken with ASD FieldSpec 3 spectrometer (its spectral range is 350-2500nm) on 8 dominant plant species of alpine swards: Juncus trifidus, Oreochloa disticha, Agrostis rupestris, Deschampsia flexuosa, Festuca airoides, Festuca picta, Luzula alpino-pilosa, Nardus stricta. These plant species were located: 0-5m, 5-10m and more than 10m distant from a touristic trail (control point). Spectral characteristics as well as vegetation indices were analyzed with ANOVA test, which showed differiential resistance to trampling of investigated plant species. The most resistant species were: Nardus stricta and Deschampsia flexuosa, whereas Oreochloa disticha and Festuca airoides appeared to be vulnerable to trampling. However, all vegetation indices for plant species were in its optimum range, so it proves that they are in a good condition. The analysis of vegetation indices enabled choosing those groups, which are the most useful in the research of mountain vegetation condition. They are: NDVI, ARVI, EVI from the broadband greeness group and mSR705 and mNDVI from narrowband greenness group (measuring chlorophyll content and cell structure), as well as WBI, NDWI, NDII from canopy water content group. The most important factor that effects investigated plant species condition is water content. The research showed that hyperspectral analysis is useful in studying human impact on vegetation cover and needs to be developed.
    Źródło:
    Teledetekcja Środowiska; 2012, 47; 75-86
    1644-6380
    Pojawia się w:
    Teledetekcja Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility of hyperspectral vegetation indices for the detection of chlorophyll concentration in three high Arctic plants: Salix polaris, Bistorta vivipara, and Dryas octopetala
    Autorzy:
    Zagajewski, B.
    Kycko, M.
    Tommervik, H.
    Bochenek, Z.
    Wojtun, B.
    Bjerke, J.W.
    Klos, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/59266.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    Remote sensing, which is based on a reflected electromagnetic spectrum, offers a wide range of research methods. It allows for the identification of plant properties, e.g., chlorophyll, but a registered signal not only comes from green parts but also from dry shoots, soil, and other objects located next to the plants. It is, thus, important to identify the most applicable remote-acquired indices for chlorophyll detection in polar regions, which play a primary role in global monitoring systems but consist of areas with high and low accessibility. This study focuses on an analysis of in situ-acquired hyperspectral properties, which was verified by simultaneously measuring the chlorophyll concentration in three representative arctic plant species, i.e., the prostrate deciduous shrub Salix polaris, the herb Bistorta vivipara, and the prostrate semievergreen shrub Dryas octopetala. This study was conducted at the high Arctic archipelago of Svalbard, Norway. Of the 23 analyzed candidate vegetation and chlorophyll indices, the following showed the best statistical correlations with the optical measurements of chlorophyll concentration: Vogelmann red edge index 1, 2, 3 (VOG 1, 2, 3), Zarco-Tejada and Miller index (ZMI), modified normalized difference vegetation index 705 (mNDVI 705), modified normalized difference index (mND), red edge normalized difference vegetation index (NDVI 705), and Gitelson and Merzlyak index 2 (GM 2). An assessment of the results from this analysis indicates that S. polaris and B. vivipara were in good health, while the health status of D. octopetala was reduced. This is consistent with other studies from the same area. There were also differences between study sites, probably as a result of local variation in environmental conditions. All these indices may be extracted from future satellite missions like EnMAP (Environmental Mapping and Analysis Program) and FLEX (Fluorescence Explorer), thus, enabling the efficient monitoring of vegetation condition in vast and inaccessible polar areas.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2018, 87, 4
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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